Rough idle and P0300 code
Warm weather came today and along with it came more problems. Drove fine in the morning then around noon I came to a stoplight and the car started to putt and jerk. I took it to autozone and got a p0300 error code.
-Had a tune up with rotor, cap and wires 30k ago
-Oil cover gasket and Intake Manifold Gasket 30k ago.
-I want to say I hear a hissing sound but cannot find where it could be coming from.
-Only jerky and rough when its at idle, not while accelerating.
-Lights aren't dimming so I can rule out an alternator or battery.
-Ran a tank of premium and seafoam through it today and drove it like it was hot.
Any suggestions on where to start would be great. I've been reading a lot of the posts but none seem to hit what I have right on the head, always seems to point in other directions. Any help would be great.